I'm looking to buy an hydraulically powered device that requires at least 3.5kg/cm2 pressure from my garden hose to operate. I have no idea how much that is, nor how to measure the pressure without buying a gauge. 

My water comes from a well, into a holding tank and is pumped to outlets via a pressure pump. Water flow is generally quite good.

My question - is there a way to estimate the pressure of the flow from my hose by other means, such as timing the flow or elevating it and doing calculations?

For the engineers here.

I thank all for any suggestions made. 

Quick Google puts that at 50psi.  Suspect your well pump ends at 30-35psi.   That is higher than normal US home water pressure.  kg/cm2 x 14.223 = psi

That is 3.5 bar or 50 psi in old money.

 

As you can see from below you will not get 3.5 bar from most domestic water pumps that sit on a yellow tank. Unless you have a high above ground tank and even then. Most max out at 2.8 bar. Although you could experiment with turning up the pressure switch setting if you have a suitable pressure gauge. 

If you have an EP constant pressure pump you may get away with it. Says 4.0 bar when flowing assuming your device doesn't restrict the flow too much.

Maybe buy a pressure gauge so you can find out.

 

 

You will need to have some form of cheap booster pump from a farm shop.

OK, Thanks guys, I knew there would be some good knowledge out there.

I need to check the pump to find it's output, but from what you say it probably wont have enough pressure. 

Plan B involves battery power.

Checked, my pump is an Hitachi TM-60L.  The maximum pressure is around 1.7 kg/cm2.  Unsuitable for my purpose.